At present, there are many methods for the treatment and disposal of oily sludge in oil fields. The treatment processes are generally concentrated, conditioned, dehydrated, discharged and comprehensively utilized.

In terms of processing technology, the typical sludge treatment processes in China are:

1. Oily sludge – natural evaporation pond;

The process is simple, and the sludge discharged from the innumerable treatment system is directly discharged into the natural evaporation pond for natural evaporation, and the water content in the mud-containing sewage is high, so a large evaporation pond is required. In the colder and more rainy eastern oilfields, the application effect is poor, and the phenomenon that the sewage overflows the evaporation pool often occurs, causing pollution of the surrounding environment.

2. Oily sludge – sludge concentration tank – sludge drying field;

3. oily sludge – concentration – panning and salt removal – flotation degreasing – pressure filtration dehydration;

The oily sludge is concentrated and settled (concentrated by adding medicine), and after reducing the water content, according to the salt content of the original mud, the water is washed in proportion to reduce the salt content. The sludge is separated by flotation, and finally subjected to pressure filtration dehydration to obtain a filter cake.

4. Oily sludge – sludge separation tank – concentration tank – high speed centrifugal separation – dry sludge tank.

The process is to dewater the crude oil, and the various equipments of the sewage treatment system will discharge the oil-containing sewage and the backwash water into the sewage buffer pool for uniform flow into the sludge separation tank. The oil and cement three-phase separation is carried out in the sludge separation tank, and the sewage oil and sewage return system of the branch is reused. The sludge in the branch office contains about 99% water. Then, the sludge pump is used to drive the concentration pump, and the concentrated floc deposit enters the centrifuge for dehydration. The dehydrated 30%~60% water sludge is stored in the dry sludge tank.

The high-specific gravity mud centrifuge produced by Hebei GN Solids control. is a special centrifuge specially used for the separation of floc sediments in the fourth process. At present, the application of multiple sludge separation projects has been carried out in domestic and foreign oil fields.

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With the development of petroleum industrialization, the pollution problem brought by the drilling process has received more and more attention. At present, there is no recognized effective treatment process suitable for drilling waste liquids in China, mainly because of the wide variety of drilling fluids and working fluid systems, complex compositions and different usage conditions. Techniques that result in waste fluids for a particular type or region of an oil field are not necessarily suitable for use with other types or regions of waste. In addition, compared with the current comprehensive level of sewage treatment in the petroleum industry, the treatment cost of drilling waste liquid and wastewater is relatively high, and the treatment effect is general. Overall, the current drilling wastewater treatment technology is still far from satisfactory.

Mainly manifested in:

1, the treatment agent is not high efficiency, can not fully achieve the treatment effect

2, the treatment method is single, the depth of pollutant removal is limited, and the treatment effect on some pollutants is not good

3. The continuous processing device is not targeted, and the processing cost is high, resulting in reduced efficiency.

According to the above analysis, no matter the above-mentioned treatment technology has a certain range of application, the method selection should be based on a certain method, according to the nature of the waste drilling fluid produced by each oil field and the geography, climate, and location of each oil field. The most reasonable optimization of the characteristics of the environment, and in order to more effectively control the problem of drilling wastewater pollution, it is recommended that future research work should not only strengthen the source and process control, but also develop new technologies. Specifically, there are the following aspects:

1. Promote clean production, cure the symptoms and improve the efficiency
2. Develop low-cost, high-performance environmentally friendly drilling fluids to help promote technology
3. Research and development of new drilling fluid water treatment agent and unified technology to improve overall processing technology
4. Develop a new technology for harmless comprehensive utilization and make environmentally friendly technologies
5. Strengthen management control, strengthen process supervision, and control from the source

The clean production drilling fluid purification equipment developed by Hebei GN Solids Control Co., Ltd. can effectively reduce the generation of drilling waste, reduce the amount of waste liquid generated by 30~50%, and effectively reduce the cost of harmless treatment. The reduction in the degree of environmental pollutants.

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In general, the typical sources of waste sludge oil sands are as follows: 1) Waste sludge oil sands produced by crude oil tank cleaning 2) Waste sludge oil sands of refineries 3) Drilling waste oil sands. What are the characteristics and hazards of these oil sands?

(1) Characteristics of oil sludge:

Its physicochemical properties are very complex, generally containing aged crude oil, waxy, asphaltenes, colloids and solid suspended solids, bacteria, parasites, salts, acid gases, corrosion products; a small amount of mechanical impurities, heavy metals and salts; Benzene, phenols, strontium, barium and other odorous toxic substances and a small amount of radioactive elements. Water treatment agents such as flocculants, corrosion inhibitors, scale inhibitors and fungicides are added in the production process; as well as oil-containing weak acid low-temperature binders, polyacrylamide sulfides and sulfonated mud systems, etc., which are extremely difficult to separate and treat.

(2) Hazardous performance:

When the volatile components enter the sky, the total hydrocarbon concentration of the air quality exceeds the standard; after entering the soil, it will cause damage to the microbial and soil plant ecosystems; after entering the water body, it will destroy the surface water and groundwater ecosystem; the harmful substances in the crude oil have Mutagenicity and carcinogenicity can cause serious damage to human health.

Oil sand separation system

GN solid control cooperated with professional customers and launched the skid-mounted oil sand separation system to solve the problem of oil sand separation. The separation solid control system is a more advanced, stable and reliable, safe and environmentally friendly treatment method, which can fully meet the requirements of field environmental operation conditions; the social value of the environmental protection industry, the economic value of resource recycling and reuse, and the market application prospects. Looking at it, it has great practical significance!

The main equipment involves centrifuges, Shale Shakers, chemical dosing equipment

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The GN solid-control oil-based cuttings disposal system consists of a collection and transmission device, a drying treatment device, a centrifugal separation device and other auxiliary devices. The system as a whole has sufficient rigidity and stability, and the system equipment runs reliably. The processing system is composed of the GNLW453C-VFD large-speed high-speed centrifuge and the GNCD930D high-speed cuttings dryer.

The main principle of action:

1. The cuttings removed by the solid-phase control equipment such as the vibrating screen, desilting and de-sluicing device, centrifuge, etc. of the drilling machine solid control system are collected by the collecting and conveying device and transported to the screw conveyor of the dryer feeding.

2. The cuttings are sent to the dryer in a spiral to carry out solid-liquid separation and drying, and the liquid is discharged into the drain tank of the dryer. The solid phase is spirally conveyed to the cuttings box through the discharge port. When the liquid level of the draining tank of the dryer reaches the warning position, the centrifugal separation device is automatically started to carry out the fine recycling treatment of the aunt.

3. The solids discharged from the centrifuge are collected through the outer discharge of the slag discharge tank, and the clean mud discharged by the centrifuge is discharged into the clear liquid recovery bin. When the liquid phase in the recovery bin reaches the warning position, the drilling is continued through the external transportation of the conveying device. jobs.

The GN solid-controlled oil-based cuttings non-landing treatment system has the following advantages:

1. The overall armoring design of the system is convenient for installation and transportation. The armoring can be hoisted and transported without disassembly.
2. The working speed of the dryer can reach 900~1200r/min. 3. The working speed of the centrifuge is 3000r/min, and the length-to-diameter ratio of the conversion is 3.42. The oil industry has a large aspect ratio design.
3. The system can realize the automatic automatic operation without liquid automatic discharge. The personnel only need to pay attention to the working state of the dryer and the centrifuge.

5, can adapt to 50% solid content, 2.2g / cm3 high density above the oil-based cuttings processing, and can reach continuous 24 hours continuous working state.

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Hebei GN Petroleum Machinery Manufacturing Co., Ltd., referred to as “GN Solid Control”, is the first manufacturer in China to manufacture equipment that does not land on mud. The drilling cutting machine produced since 2014 has sold 60 sets of rock drills. The chip drying system sold nearly 45 sets. It is the manufacturer with the highest domestic output and largest sales volume. GN’s solids-controlled rock chip drying system is based on the advantages of high-quality equipment at home and abroad. It has been developed in combination with practical application cases at the drilling site. It has the advantages of non-blocking, large processing volume, high processing efficiency, high failure rate, and low failure rate. Easy to operate and other advantages.

Modular components:

1. Cuttings conveying device:

The cuttings conveying device is composed of a conical cuttings receiving funnel, a sludge vacuum pump and a control device, and can receive drill cuttings and drilling waste conveyed by the screw conveyor of the solid control equipment. The drill cutting pump is driven by a motor, which draws the cuttings by vacuum and delivers it to the drill drying screen or the drill cutting machine. The sludge vacuum pump has super self-priming ability and is specially used for conveying high viscosity and high solid content wear-resistant acid and corrosion resistant medium, and the output pressure without seal structure is high.

2. Drilling chip drying sieve device:

The cuttings drying screen device consists of a GN cuttings drying screen and a mud receiving tank. It can process the drilling waste drills discharged from the solids control equipment and discharge the relatively dry drilling debris for further post-processing. The collection tank at the bottom of the drill cutting screen is tapered to facilitate cleaning and is not easy to accumulate sand. It can receive the mud after the drying screen treatment, and there is a slurry outlet at the bottom of the tank to be connected to the centrifuge pump. The GN drying sieve feed hopper can meet the screw conveyor into the pulp and the cuttings feed pump tube into the pulp.

3, drill cutting machine:

GN dryer module, the operation platform to reduce the time to a minimum, the total height can be satisfied without dismantling the dryer in the case of road transport is not high. After the working platform is raised, the slagging and draining requirements of the drill cutting and drying machine can be met. This platform can be equipped with cantilever crane, flushing pump and variable frequency control cabinet according to customer requirements. The cantilever crane is mounted on the working platform and can be lowered during transportation. Explosion-proof control cabinets and flushing pumps can be placed on the base of the platform or next to the tilting seat.

4. Centrifuge:

GN centrifuge module, operating platform for placing the crown energy centrifuge as a working platform. The platform transportation time is reduced to a minimum, and the total height can be satisfied without excessive road transport without disassembling the centrifuge. The elevated working platform can meet the slag discharge and drainage requirements of the centrifuge. This platform can be equipped with slurry pump and frequency conversion control cabinet according to customer requirements. Explosion-proof control cabinets and feed pumps can be placed on the bottom of the platform or beside the seat.

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The liquid-gas separator is a kind of equipment that uses hydrogen sulfide-resistant material and liquid-liquid separator for drilling fluids and uses high-quality materials through modern technology. The combination of liquid-gas separator and electronic ignition device can effectively prevent carry-over in drilling fluids. The erosion of harmful gases ultimately ensures the safety of personnel and field equipment.

When the construction is carried out, some poisonous and harmful gases carried in the drilling fluid will be carried over. This will cause a large deviation in the specific gravity and viscosity of the drilling fluid and cannot meet the requirements for drilling; and if the problem is serious, if Failure to cause a kick or even a blowout accident will occur in time. The liquid-gas separator can ensure the smooth progress of the drilling process when used with the electronic ignition device.

The design of the liquid-gas separator is mainly used to separate large amounts of dissolved gas or free air mud, and because these gases expand in volume under normal pressure. Therefore, in the traditional liquid-gas separator located between the choke manifold and the drilling fluid shaker, a special pipe line for exhaust gas is connected to avoid this situation.

At the drilling site, the frequency of the use of liquid-gas separators and electronic ignition devices is not high, but the importance is unquestionable. In case of special circumstances, blowout accidents will not only cause major economic and property losses to the country and individuals, but also cause significant pollution to the on-site soil and surrounding environment, and the subsequent flocking will be far-reaching.

The GNZYQ1000A series liquid-gas separator is a good choice for the mud gas separator. The gas well drilling fluid enters the separator through the tangent line of the inlet of the separator, and the inner wall falls on the specially designed multiple inner baffles in the collision. At the same time, the exposed surface area is increased, flowing downwards, creating a turbulent state that separates the gas from the drilling fluid. The final free gas is discharged through the gas outlet at the top of the tank. The length of the exhaust pipe is determined and matched by the site and brought to the safety department. The degasified safe drilling fluid is discharged into the subsequent mud processing system.

GN solid control company’s GNYD electronic ignition device can promptly and accurately ignite the toxic flammable gas emitted from the outlet of the discharge nozzle in the moment of gas ejection to eliminate the pollution of the gas to the environment and the damage of humans and animals. Guanneng electronic ignition device and can be configured with solar panels, through the use of solar energy for post-charge operations, to achieve the purpose of energy conservation and environmental protection.

GN solid control will provide you with high-quality liquid-gas separators, competitive prices at factory direct sales, and provide you with satisfactory after-sale technical services for oil-field drilling fluid liquid-gas separators and electronic ignition devices.

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Hebei GN Petroleum Machinery Manufacturing Co., Ltd. specializes in the design, R&D, and manufacturing of drilling mud solids control equipment and drilling waste disposal equipment. GN solid control is the leading brand of drilling mud solids control equipment at home and abroad. The first to establish a branch in the United States and Russia. The main manufacturing product modules are: solid control equipment and accessories manufacturing modules, drilling waste treatment equipment modules, complete mud circulation system modules, and pump delivery equipment modules.

Water-based mud treatment site

The technical parameters and indicators for complete sets of equipment for water-based mud waste while drilling are as follows:

1. According to the amount of drilling waste generated during the drilling process, special construction process conditions such as running slurry and cementing are taken into account. The GN waste treatment plant has a designed processing capacity of 20 to 60 cubic meters per hour (including rock solidification, waste mud and waste water treatment), and operates for 24 hours.

2. After the drilling wastewater and solid waste are treated by the device, after the drilling water is purified and treated, the water quality index approaches the first-grade standard of Integrated Wastewater Discharge Standard. The main technical indicators of exudate of solidified mud cakes after cutting debris and waste mud, wastewater preparation and separation are close to the first level standard of Integrated Wastewater Discharge Standard. Solid waste complies with the technical requirements for Class II solid wastes in the “Standard for Pollution Control in General Industrial Waste Storage and Disposal Sites.”

GN cuttings curing system: automatic continuous curing can be achieved. Processing capacity 15 cubic meters / hour.

Feature 1: It can be automatically continued, the processing capacity is adjustable, and the amount of added materials can be adjusted. Save labor costs and have high efficiency.

Features II: GN armored curing system, when transported, after a simple disassembly, the solidified mud agitator part and drill cuttings storage funnel part can be transported together into a 40-foot high cabinet to meet international shipping requirements. And can meet the inland transportation size requirements of various countries.

Features 3: Curing mixer inlet, equipped with two 1.5-inch inlet, you can add water from this port, or add acid and alkali liquid curing material.

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GN solid control trenchless & shield engineering:

GN solid control construction industry mud recovery systems and waste mud treatment systems have been widely used in China, Australia, the United States, and Southeast Asia, the Middle East and more than 30 countries and regions.

The efficient shielded mud separation station is a key core component of mechanized tunnelling. Bentonite slurry plays an important role in the construction of the hybrid shield machine. The slurry can stabilize the tunnel support surface and transmit cuttings during the shield construction process. GN shield mud and water separation system uses drilling fluid vibrating screen, de-sanding device, drilling fluid desilter and mud centrifuge to separate drill cuttings mud mixture produced during shield construction. Through efficient and continuous separation, the excavated material is separated from the bentonite mud, and then the mud is returned to the muddy water loop and used again.

GNLW764A decanter centrifuge is specially designed and developed for the treatment of shield slurry. The drum diameter is large and the aspect ratio is high. The separation factor is as high as 3000G. As a result, greater throughput can be achieved and more clear liquids can be discharged. Meet the requirements of large-scale shield machine construction.

GN also provides a flocculation dosing system for chemically assisted decanter centrifuges to separate the shield slurry to obtain dischargeable clean water.

GNLW764A Decanter Centrifuge Parameters

Model   GNLW764A

Drum size 760x3344mm

Speed ​​(separation factor) 2650RPM (3000G)

Differential speed 5-28RPM

Motor Power 132KW, Auxiliary 90KW

Speed ​​control method Dual frequency control

Rated processing capacity 120m3 (solid content <20%)

Differential torque 25000 N.M

Size (mm) 5500x2000x1700mm

Weight (KG) 17000KG

Mud centrifuge

Mud centrifuge

Advantages:

1. The large drum meets the large throughput requirements of the shield.
2. The aspect ratio is as high as 4.4, and the separation factor is as high as 3000G, and the separation is more thorough.

3, speed, differential speed, liquid pool depth and flexible adjustment to adjust the slag dry humidity.

4, imported CNC equipment processing, rotor after high-speed dynamic balance, automatic lubrication.

5, equipped with 25000N.M large torque differential to meet the heavy load processing.

6, Centrifugal pouring drum, wear-resistant alloy blade protection, slag discharge wear protection sleeve, SKF bearings, greatly improve the service life and reduce maintenance costs.

7, PLC intelligent control system, HMI visual operator interface, bearing temperature protection, vibration protection, overload protection, easy to use.

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The intelligent control variable frequency positive pressure cabinet is integrated with HMI, PLC and frequency converter. It can realize the frequency conversion control mode of the mud centrifuge and make the operation more user-friendly. The customer can select different rotation speeds and differential rotation speeds according to the site material conditions.

The automatic control makes the equipment more widely applicable to the site. The customer sets the host speed 0-3200r/min according to different materials, and the differential speed is arbitrarily adjusted at 10-45r/min; the status screen automatically reminds the maintenance parts of the centrifuge maintenance parts and alarms. Make up for the staff’s negligence to bring about the damage to the equipment; The alarm screen shows the fault alarm when the electrical equipment has problems, which is the user can find the problem in time.

Positive pressure control cabinets operate much more clean instrument air than previous explosion-proof frequency conversion cabinets. For most customers, it seems more troublesome than explosion-proof explosion control cabinets. The following points are used as comparisons:

1. Performance and Heat Dissipation of Inverter (ABB Drive as an Example)

The inverter needs to dissipate a lot of heat during normal operation. The inverter requires the best performance at a constant temperature (typically 40-50°C). How can the heat be transmitted in a confined space? There are two types of heat. Methods; a) Heat exchange b) Cooling through the outside world.

1. A) Flameproof inverter is hot swap:
2. B) Positive pressure ventilation control cabinet
3. We speak from explosion-proof performance
4. A) Explosion-proof explosion-proof:

It is the explosive gas that can enter the shell, but the flame gas can not be transmitted to the outside through the joint surface during the explosion. That is, the explosion-proof body can prevent the flame inside the box from spreading out after the explosion, but the explosion inside the box will be damaged. Components are also a loss.

1. B) Positive pressure explosion-proof control cabinet

To ensure that the pressure of the instrument gas inside is higher than that of the outside world, that is, the pressure inside the box is higher than the outside of the box. The concentration of explosive gas outside the box cannot enter the inside of the box or the concentration of the explosive gas enters the explosion limit, so it is not Poor students will explode.

In general, the positive pressure explosion-proof control cabinet seems to be more troublesome than the explosion-proof control cabinet, but it is safe and reasonable.

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GN Solid Controls is committed to the design, development and manufacturing of high-performance industrial decanters. Horizontal spiral unloading sedimentation centrifuges have been widely used in various fields since the 19th century based on the same theory of centrifugal sedimentation. GN Solid Control can manufacture centrifuges with drum diameters as small as 220mm (9 inches) up to 760mm (30 inches), with an aspect ratio of up to 4.2 and a separation factor of up to 3000G. It is a professional manufacturer of decanters in the industry that has both the API certification for oil drilling industry and the EU export CE certification.

GN solid-controlled tunnel shield slurry slurry processing system is mainly composed of GNLW764A-VFD horizontal screw centrifuge and GNLR-10000S flocculation dosing system, GNGH-15C automatic curing system. It is characterized by strong waste disposal capacity, high efficiency, 24-hour continuous operation, and high automation. A complete system can realize remote operation or complete operation of one operator, low maintenance cost, compact footprint, and convenient module for transport lifting. The design eliminates manual disassembly and other aspects.

GN tunnel shield waste mud processing system specific workflow:

The working process of the whole system is as follows: Start the GNLW764A-VFD centrifuge module first, and after the centrifuge runs smoothly, start the liquid supply screw pump for the centrifuge, open the screw pump into the slurry valve, and extract the slurry from the customer storage tank to be treated. In this process, the dosing screw pump in the GNLR-10000S flocculation dosing system is started at the same time. There are two sets of drug supply pump lines, which can be directly supplied to the centrifuge inlet or supplied to the screw pump according to the effect of the centrifuge treatment. The slurry inlet is treated with flocculation to increase the centrifuge throughput and treatment efficiency. The solid phase processed by the centrifuge is discharged into the customer collection tank through the sand pit of the centrifuge. The dry slag is transported to the GNGH-15C automatic curing system through the conveying screw at the bottom of the collection tank for further drying treatment. The discharge can be processed below 20%. Solid dry residue with moisture content. The liquid that has been treated by the centrifuge reaches the customer’s requirements and the clean mud goes through the customer’s manifold and enters the wellhead or into the customer’s storage tank. This process is repeated to achieve the reuse of drilling fluid, or directly discharged into the municipal sewage pipe network for direct discharge. In order to achieve energy-saving emission reduction and environmental protection purposes.